BURLINGAME — Both sides of Highway 101 were closed as of 10 p.m. Friday after a collision knocked downed high voltage power lines, a California Highway Patrol officer said.

Southbound traffic was being diverted at Millbrae Avenue and northbound traffic was diverted at Anza Boulevard, said CHP Officer Peter Van Eckert.

Delays of up two hours were expected, according to the CHP.

Heavy equipment struck a PG&E tower in Burlingame, causing momentary flickering in parts of the Bay Area, including AT&T Park, said PG&E spokesman J.D. Guidi. No customers were left without power, but several commuters were stuck in the standstill on Highway 101.

One PG&E crew was on the scene as of 11 p.m. and additional personnel were en route, Guidi said.

“Our crews are currently working to make the area safe,” he said.

Motorists on Highway 101 whose cars may be in contact with the downed power lines should remain in their car until advised otherwise by the fire department, Guidi said.

PG&E did not have an estimate time as to when the lines would be cleared. Faryal Saiidnia, of San Bruno, was heading to the East Bay to visit family when she became one of the hundreds of motorists stopped on Highway 101, she said. She counted at least 200 cars stopped near her, with most of their engines and lights off.

“I can see never ending cars ahead and at least 50 rows of car behind, times five lanes,” she said. “The whole shoulder if filled with cars too.”

Saiidnia said the road was nearly pitch black, with the exception of motorists and passengers checking their phones for updates.

“It’s weird. It feels like the apocalypse or something. It’s very odd,” she said.

Several people were having “dance parties in their cars” and a group of young adults played volleyball nearby, Saiidnia said. Some drivers began jumping the fence at the side of the highway to shop at nearby stores.

A majority of the people stuck on Highway 101 were checking social media for updates, she said. “It’s very frustrating because we have no idea.”